zookeeper版本查看运行命令：echo stat|nc localhost 2181
显示如下图所示：
Zookeeper version: 3.4.5-cdh6.3.2--1, built on 11/08/2019 13:15 GMT
Clients:
/127.0.0.1:44814[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/0
Received: 9
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x68
Mode: standalone
Node count: 4